DHCP Server -> Client port requirements
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Max Coder
Jan 20, 2025, 7:08:34 AM1/20/25
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Hi,
I've got two Windows Server 2022 machines that are in DHCP Failover hot-standby configuration.
In addition, within the hot-standby configuration there are a number of scopes.
My question are:
1- I need open TCP port 647 to listen for failover messages between two failover partner servers. bidirectional right?
2 - What port does IP-Helper use for relaying DHCP requests? Do you need to open UDP ports 67 and 68 between dhcp server and dhcp client? In other words, if there is a Firewall between the client that will get ip address from DHCP and DHCP Servers, is there any need to open any ports? If yes, which ports need to be opened?
I've got two Windows Server 2022 machines that are in DHCP Failover hot-standby configuration.
In addition, within the hot-standby configuration there are a number of scopes.
My question are:
1- I need open TCP port 647 to listen for failover messages between two failover partner servers. bidirectional right?
2 - What port does IP-Helper use for relaying DHCP requests? Do you need to open UDP ports 67 and 68 between dhcp server and dhcp client? In other words, if there is a Firewall between the client that will get ip address from DHCP and DHCP Servers, is there any need to open any ports? If yes, which ports need to be opened?
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